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Circular Data Images for Directional Data (2004)

Author: Morpet, William J
Subject: SATELLITE INSTRUMENTS; FLIGHT INSTRUMENTS; BUS CONDUCTORS; DATA INTEGRATION; SPACECRAFT MODELS; OBSERVATORIES; COSTS
Year: 2004
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

Directional data includes vectors, points on a unit sphere, axis orientation, angular direction, and circular or periodic data. The theoretical statistics for circular data (random points on a unit circle) or spherical data (random points on a unit sphere) are a recent development. An overview of existing graphical methods for the display of directional data is given. Cross-over occurs when periodic data are measured on a scale for the measurement of linear variables. For example, if angle is represented by a linear color gradient changing uniformly from dark blue at -180 degrees to bright red at 180 degrees, the color image will be discontinuous at 180 degrees and -180 degrees, which are the same location. The resultant color would depend on the direction of approach to the cross-over point. A new graphical method for imaging directional data is described, which affords high resolution without color discontinuity from ''cross-over''. It is called the circular data image. The circular data image uses a circular color scale in which colors repeat periodically. Some examples of the circular data image include direction of earth winds on a global scale, rocket motor internal flow, earth global magnetic field direction, and rocket motor nozzle vector direction vs. time.

Creative Commons license: Public Domain

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Identifier:	nasa_techdoc_20050000122
Document-source:	CASI
Documentid:	20050000122
Nasa-center:	Marshall Space Flight Center
Online-source:	http://wayback.archive-it.org/1792/20100127215515/http://hdl.handle.net/2060/20050000122
Original-nasa-rights:	Unclassified; Copyright; Unlimited; Publicly available;
Updated-added-to-ntrs:	2009-07-29
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20050000122
Identifier-ark:	ark:/13960/t4th9d94v
Ppi:	300
Ocr:	ABBYY FineReader 8.0